<header class="bar bar-nav" style="z-index:3000;">
        <button class="button button-link button-nav pull-left"><a href="./video.html">视频</a></button>
        <button class="button button-link button-nav pull-left"><a href="./people.html">人</a></button>
        <button class="button button-link button-nav pull-left"><a href="./dynamic.html">动态</a></button>
    </header>